OK, so they were pretty darn good on frozen water, but how will Olympic ice dancing champs Charlie White and Meryl Davis fare without their skates — and each other — as they compete separately in the ballroom? That’s one of the key questions going into the 18th season of this sequin-studded reality show. And here’s another: Will we embrace Erin Andrews, who replaces Brooke Burke-Charvet as Tom Bergeron’s new co-host? (For recaps of the show, go to www.mercurynews.com/tv).

“Brain Games” (9 p.m., National Geographic): This addictive show continues to mess with our heads. In the midseason finale, Jason demonstrates how humans are just natural copycats as much of our everyday behavior is influenced by mimicking others. In other words: monkey see, money do.

DirecTV Now has some attractive features, including its price, but the overall service is disappointing and an inadequate substitute for a traditional pay TV package, Tech Files columnist Troy Wolverton says.